[pascal] Fix bug in determining reachability after 'or'
[pascal] Fix bug in determining reachability after 'or'

This applies the fix from 41be111dac7f57935c60f97f5722f691c811743d
to the pascal backend code.

snowballstem/snowball,snowballstem/snowball,snowballstem/snowball,snowballstem/snowball,snowballstem/snowball,snowballstem/snowball,snowballstem/snowball,snowballstem/snowball